Solr Caching

[Furkan KAMACI]

I've just started to read about Solr caching. I want to learn one thing.
Let's assume that I have given 4 GB RAM into my Solr application and I have
10 GB RAM. When Solr caching mechanism starts to work, does it use memory
from that 4 GB part or lets operating system to cache it from 6 GB part of
RAM that is remaining from Solr application?